Rollup merge of rust-lang#99523 - cuviper:asfd_ptrs-1.64, r=jyn514

Fix the stable version of `AsFd for Arc<T>` and `Box<T>`

These merged in rust-lang#97437 for 1.64.0, apart from the main `io_safety`
feature that stabilized in 1.63.0.

library/std/src/os/fd/owned.rs

@@ -356,7 +356,7 @@ impl From<OwnedFd> for crate::net::UdpSocket {
     }
 }
 
-#[stable(feature = "io_safety", since = "1.63.0")]
+#[stable(feature = "asfd_ptrs", since = "1.64.0")]
 /// This impl allows implementing traits that require `AsFd` on Arc.
 /// ```
 /// # #[cfg(any(unix, target_os = "wasi"))] mod group_cfg {
@@ -379,7 +379,7 @@ impl<T: AsFd> AsFd for crate::sync::Arc<T> {
     }
 }
 
-#[stable(feature = "io_safety", since = "1.63.0")]
+#[stable(feature = "asfd_ptrs", since = "1.64.0")]
 impl<T: AsFd> AsFd for Box<T> {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {